<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    body {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100%;
      height: 100vh;
      background-color: #000;
    }
    .loading {
      width: auto;
      height: auto;
      background-color: rgba(41, 125, 185, 0.7);
      display: table-cell;
      border-radius: 50%;
      vertical-align: middle;
    }
    .dount {
      width: 50px;
      height: 50px;
      margin: 0 auto;
      border: 5px solid #80bfe9;
      border-left-color: #fff;
      box-shadow: rgb(11, 234, 235) 0px 0px 20px;
      border-radius: 50%; 
      animation: dount-anti 1.2s linear infinite;
    }
    @keyframes dount-anti {
      0% {transform: rotate(0deg)}
      100% {transform: rotate(360deg)}
    }
  </style>
</head>
<body>
  <div class="loading">
    <div class="dount"></div>
  </div>
</body>
</html>